This page explains how James R. Morris (USATT# 8495)'s rating went from 1807 to 1790 at the 17th Annual Decatur Open held on - 16 Aug 2008. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.